Expectancy of success and the probability learning of middle-class lower-class, and retarded children.
D000124:Achievement; D000704:Analysis of Variance; D001290:Attitude; D002648:Child; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D007858:Learning; D008297:Male; D011337:Probability Learning; D012055:Reinforcement Schedule; D012923:Social Class